The Western Digital WD Black SN8100 4TB is the objective winner of this comparison, securing more individual specification victories than its counterpart. While both drives share several identical technical characteristics, the 4TB model provides the most significant advantage by offering 300% more storage capacity than the 1TB version. This substantial increase in total space makes the higher-capacity drive the superior choice for users who prioritize maximum data retention and long-term storage utility.

Users should select the Western Digital WD Black SN8100 1TB if their primary goal is to minimize the initial MSRP, as it holds a 67% advantage in that category. Conversely, the Western Digital WD Black SN8100 4TB is the ideal component for those who require extensive capacity for large files and applications. By choosing based on these specific advantages, buyers can align their purchase with either a focus on lower upfront costs or significantly greater storage volume.